Gr 11 Physical Sciences: Ch 10.1 Energy changes in chemical reactions
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Questions and Answers

What happens to the bonds in the reactants during a chemical reaction?

  • They remain unchanged
  • They dissolve
  • They form new bonds
  • They break (correct)
  • What is the energy required to break a bond called?

  • Bond strength
  • Bond dissociation energy
  • Bond formation energy
  • Bond energy (correct)
  • What is the concept that measures the total energy of a chemical system at a given pressure?

  • Enthalpy (correct)
  • Entropy
  • Energy
  • Bond energy
  • What type of reaction releases energy because the energy required to break bonds in the reactants is less than the energy released when new bonds form in the products?

    <p>Exothermic reaction</p> Signup and view all the answers

    What is the change in enthalpy (ΔH) during a reaction an indication of?

    <p>Whether the reaction absorbs or releases energy</p> Signup and view all the answers

    What type of reaction absorbs energy because the energy required to break bonds in the reactants is more than the energy released when new bonds form in the products?

    <p>Endothermic reaction</p> Signup and view all the answers

    What is the result of the energy required to break bonds in the reactants being less than the energy released when new bonds form in the products?

    <p>Energy is released</p> Signup and view all the answers

    What is the representation of an exothermic reaction?

    <p>Reactants → Products + Energy</p> Signup and view all the answers

    What is the primary reason for energy changes in chemical reactions?

    <p>Breaking of bonds in the reactants</p> Signup and view all the answers

    What is the term used to describe the energy needed to break a chemical bond between two atoms?

    <p>Bond dissociation energy</p> Signup and view all the answers

    Which of the following statements is true about exothermic reactions?

    <p>The energy of the products is lower than the energy of the reactants</p> Signup and view all the answers

    What is the result of the energy required to break bonds in the reactants being equal to the energy released when new bonds form in the products?

    <p>No net energy change occurs</p> Signup and view all the answers

    Which type of reaction would occur if the energy required to break bonds in the reactants is significantly less than the energy released when new bonds form in the products?

    <p>Exothermic reaction</p> Signup and view all the answers

    What is the primary difference between exothermic and endothermic reactions?

    <p>The direction of energy flow</p> Signup and view all the answers

    Which of the following reactions would require energy input from the surroundings?

    <p>Endothermic reaction</p> Signup and view all the answers

    What is the term used to describe the total energy of a chemical system at a given pressure?

    <p>Enthalpy</p> Signup and view all the answers

    What is the primary cause of energy changes in a chemical reaction?

    <p>The breaking and formation of chemical bonds</p> Signup and view all the answers

    Which of the following is NOT a characteristic of an exothermic reaction?

    <p>The reaction absorbs energy from the surroundings</p> Signup and view all the answers

    What is the relationship between bond energy and the energy required to break a bond?

    <p>Bond energy is the energy required to break a bond</p> Signup and view all the answers

    In an endothermic reaction, what is the relationship between the energy required to break bonds and the energy released when new bonds form?

    <p>The energy required to break bonds is more than the energy released when new bonds form</p> Signup and view all the answers

    What is the purpose of considering enthalpy (H) in chemical reactions?

    <p>To calculate the total energy of the chemical system at a given pressure</p> Signup and view all the answers

    In which type of reaction is the energy of the products higher than the energy of the reactants?

    <p>Endothermic reaction</p> Signup and view all the answers

    What is the result of the energy required to break bonds in the reactants being exactly equal to the energy released when new bonds form in the products?

    <p>No energy change occurs</p> Signup and view all the answers

    Which of the following is a characteristic of both exothermic and endothermic reactions?

    <p>Bonds in the reactants break and new bonds form in the products</p> Signup and view all the answers

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